Of all the thousands of cars that rolled through Altoona on that July day in 1952, a couple at the head end of a manifest, PRR 9615 east, are identified over 60 years later: loaded flat with a pair of dump trucks on it and a Seaboard Air Line boxcar.
Comments:
I think it is a B-4 boxcar, they were SAL's ubiquitous steam era boxcar, similar to the ARA XML. (from steamerafreightcars.com: "In 1929, SAL ordered 1000 B-4 class cars from both Pullman and Standard Steel. Numbered 13001-13999, the B-4s were virtually identical to the B-3s. The B-4s maintained the same 40-ton rating and interior dimensions as the B-3s, as well as the fishbelly centersill underframe and Camel doors. However, there were several notable differences, including Pullman flat plate ends, often called “X-29” ends, AAR trucks, and a small 18” lumber door on the B end. Like the B-3s, the B-4s were also variants of the ARA 4C-XM1 design." -webmaster)